Help Me! (SSH/SCP)

I am trying to remotely access a computer through my LAN. Using SCP I am not able to get through using the terminal.

WAN IP: 24.205.245.xxx
LAN IP: 192.168.1.113

I am using the command:
scp file.pdf <user>@<WAN IP>:<destination>
and naturally this is not working. The only way I can get a transfer going is to try and transfer to the <user> root at the WAN IP and this ends up downloading the file to my router, which of course doesn't work (the router stalls and I have to manually reboot the thing).

Can anyone help me here, this bugging the crap out of me.
Oh and I have port 22 forwarded.

Overall the issue here is how do I direct the incoming file through the WAN IP to the LAN IP??? (get the file to go to the correct computer on the LAN).

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